An excess flow valve (EFV) is a mechanical safety device designed to restrict or shut off flow. In the event of a line rupture or gas leak, the EFV will restrict or shut-off flow until line pressure equalizes. Excess flow valves are used in a variety of applications ranging from small laboratories to large refineries, chemical processing plants, the semiconductor industry, pharmaceutical, biotech, food and beverage plants.
Which one is right for your application? Learn more about the similarities and differences between ChemTec’s excess flow valves: EFV Series, EFV MRS Series, and HPEFV Series.
EFV Series
The EFV series is an adjustable unit with either a controlled bleed or a positive shut-off option. This unit is an auto-reset model, which prevents the uncontrolled flow of liquids and gasses, offering a positive shut-off when the gas flow exceeds a certain set limit.
To resume normal flow, a bypass or controlled bleed releases the excess pressure built up, allowing the valve to reset automatically. Key features include:
- Material: Brass or 316 stainless steel; other material upon request
- Function: Restricts or shuts off flow
- Application: chemical processing, semiconductor industry, pharmaceutical, biotech, food and beverage industry, gas analyzers, CNG delivery lines, industrial distribution lines
EFV MRS Series
What sets the EFV MRS apart from other excess flow valves is its manual reset; the unit has an internal bypass system that allows the user to bleed the line and equalize pressure. Key features include:
- Material: Brass or 316 stainless steel, other material upon request
- Applications: chemical processing, semiconductor industry, pharmaceutical, biotech, food and beverage industry, gas analyzers, CNG delivery lines, industrial distribution lines
- Function: Restricts or shuts off flow
High-Pressure Safety Excess Flow Valve (HPEFV)
Like the EFV series, the HPEFV operates like a standard EFV but for high-pressure applications. Key features include:
- Material: 316 stainless steel
- Applications: High-pressure plant lines, hydraulic systems, CNG delivery systems
- Function: Restricts or shuts off flow
- Maximum Pressure: 6000 PSIG
Find High-Quality Excess Flow Valves at ChemTec
ChemTec’s Excess Flow Valves can be field-adjustable or factory preset to shut off at a desired set point. Excess flow valves are a safety measure employed to shut down a line in the event of a rupture or leak.
At ChemTec, our representatives are always here to help you find the right option for your system. Submit an application inquiry today to find the product that meets your needs.
*Note: Calibration is performed using air flow equivalent to the atmosphere.
